添加使用dtd文件
如Mybatis中使用DTD来验证XML

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE configuration     PUBLIC "-//mybatis.org//DTD Config 3.0//EN"     "http://mybatis.org/dtd/mybatis-3-config.dtd">

还可以在其发行包中org.apache.ibatis.builder.xml.dynamic中找到mybatis-3-config.dtd，mybatis-3-mapper.dtd,放到类路径下，然后将上面的头改成

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"          "./mybatis-3-config.dtd">

或者

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "../../../../../mybatis-3-mapper.dtd">

看路径啦

同时也可以这样来哦

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "file:///d:/workspace/MyEclipseSSH/mybatis304/src/mybatis-3-mapper.dtd">

Myeclipse window - preferences - Myeclipse enterprise - Files and Editors - xml - xml catalog - Add